Yakhontovite
Yakhontovite is a rare monoclinic mineral with the chemical formula (Ca,Na,K)0.2(Cu,Fe,Mg)2(Si4O10)(OH)2·3H2O. It belongs to the silicate class and is classified under the Strunz system as 9.EC.40 and the Dana system as 71.3.1b.7. This mineral is typically characterized by its soft, fibrous structure, with a dull to pearly luster. It is generally light in color, often appearing white or pale green. With a low hardness and moderate density, yakhontovite is a hydrated phyllosilicate that is notable for its complex chemical composition involving copper, iron, and magnesium in its structure.
Overview
Yakhontovite is a rare monoclinic mineral with the chemical formula (Ca,Na,K)0.2(Cu,Fe,Mg)2(Si4O10)(OH)2·3H2O. It belongs to the silicate class and is classified under the Strunz system as 9.EC.40 and the Dana system as 71.3.1b.7. This mineral is typically characterized by its soft, fibrous structure, with a dull to pearly luster. It is generally light in color, often appearing white or pale green. With a low hardness and moderate density, yakhontovite is a hydrated phyllosilicate that is notable for its complex chemical composition involving copper, iron, and magnesium in its structure.
Etymology
Yakhontovite is named after Liia K. Yakhontova, a mineralogist who contributed to its study. The mineral was officially approved by the IMA, but no specific discovery year is provided in the facts.
How to recognize it
Yakhontovite can be identified by its softness, with a hardness below 4 on the Mohs scale. It typically exhibits a white or pale green color and a dull to pearly luster. Its streak is likely white or colorless. Due to its rarity and softness, it is not commonly confused with other minerals, though its fibrous appearance may resemble other phyllosilicates. Its low hardness and hydration content are key distinguishing features.
Trivia
Yakhontovite is notable for its complex chemical composition, which includes multiple cations such as calcium, sodium, potassium, copper, iron, and magnesium. It is a rare mineral with a unique monoclinic crystal system. Additionally, its hydration content, with three water molecules per formula unit, contributes to its soft and fibrous nature.